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Seasonal variations in dissolved organic matter concentration and composition in an outdoor system for bank filtration simulation

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Journal of Environmental Sciences 2024年第1期135卷 252-261页

作者： Muhammad Zeeshan Omamah Ali Shamas Tabraiz aki sebastian ruhl German Environment Agency Section II 3.3Schichauweg 5812307BerlinGermany Technische Universitat Berlin Water TreatmentKF4Str.des 17.Juni 13510623BerlinGermany Natural and Applied Sciences Section School of Psychology and Life SciencesCanterbury Christ Church UniversityCanterburyCT11QUUK

Dissolved organic matter(DOM)in surface waters can vary markedly in character depending on seasonal variations such as rainfall intensity,UV radiations and *** in DOM as well as temperature and rainfall intensity over the year can affect the biochemical processes occurring in bank filtration(BF).Identification and characterization of DOM in the surface water could help to optimize the water treatment and provide stable and safe drinking *** study investigated year-long variations of DOM concentrations and compositions in a surface water of a circulated outdoor pond(research facility)connected to a BF *** was dominated by humic substances and a changing pattern of DOM in surface water was observed throughout the year.A significant increase of DOM(~38%)in surface water was noted in August compared to *** fluorescent DOM showed that DOM in summer was enriched with the degradable fraction whilst non-degradable fraction was dominated in winter.A constant(1.7±0.1 mg/L)effluent DOM was recirculated in the system throughout the *** removal through BF varied between 4%to 39%and was achieved within a few meters after infiltration and significantly correlated with influent DOM concentration(R^(2)=0.82,p0.05)change in the removal of DOM was observed in two subsurface layers(upper and lower).This study highlights the presence of a constant non-degradable DOM in the bank filtrate,which was not affected by temperature,redox conditions and UV radiations.

关键词： Bank filtration Dissolved organic matter Dissolved oxygen Fluorescence spectroscopy Excitation-emission matrix

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Screening for 26 per-and polyfluoroalkyl substances(PFAS)in German drinking waters with support of residents

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Eco-Environment & Health 2023年第4期2卷 235-242页

作者： Vanessa Ingold Alexander Kämpfe aki sebastian ruhl German Environment Agency Section II 3.3Schichauweg 5812307BerlinGermany German Environment Agency Section II 3.2Heinrich-Heine-Straße 1208645Bad ElsterGermany Technische Universität Berlin Chair of Water TreatmentKF4Straße des 17.Juni 13510623BerlinGermany

The occurrence of per-and polyfluoroalkyl substances(PFAS)in water cycles poses a challenge to drinking water quality and *** order to counteract the large knowledge gap regarding PFAS in German drinking water,89 drinking water samples from all over Germany were collected with the help of residents and were analyzed for 26 PFAS by high-performance liquid chromatography with tandem mass spectrometry(HPLC-MS/MS).The 20 PFAS recently regulated by sum concentration(PFAS_(∑20)),as well as six other PFAS,were quantified by targeted *** all drinking water samples,PFAS_(∑20 )was below the limit of 0.1μg/L,but the sum concentrations ranged widely from below the limit of quantification up to 80.2 ng/*** sum concentrations(PFASP4)of perfluorohexanesulfonate(PFHxS),perfluorooctanesulfonate(PFOS),perfluorooctanoate(PFOA),and perfluorononanoate of 20 ng/L were exceeded in two *** most frequently detected individual substances were PFOS(in 52%of the samples),perfluorobutanesulfonate(52%),perfluorohexanoate(PFHxA)(44%),perfluoropentanoate(43%)and PFHxS(35%).The highest single concentrations were 23.5 ng/L for PFHxS,15.3 ng/L for PFOS,and 10.1 ng/L for *** regionally elevated concentrations were identified,but some highly urbanized areas showed elevated *** of substitution PFAS,including 2,3,3,3-tetrafluoro-2-(heptafluoropropoxy)propanoate and 2,2,3-trifluor-3-[1,1,2,2,3,3-hexafluor-3-(trifluormethoxy)propoxy]-propanoate(anion of ADONA),were very low compared to regulated *** most frequently detected PFAS were examined for co-occurrences,but no definite correlations could be found.

关键词： Persistent chemicals Organic micro-pollutants EU drinking water directive Indicator PFAS Drinking water

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Electro-tribological properties of diamond like carbon coatings

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Friction 2020年第2期8卷 451-461页

作者： Iñigo BRACERAS Iñigo IBÁNEZ Santiago DOMINGUEZ-MEISTER Xabier VELASCO Marta BRIZUELA Iñaki GARMENDIA Tecnalia Research&Innovation Mikeletegi Pasealekua 2Donostia-San Sebastian 20009Spain Mechanical Engineering Department University of the Basque Country UPV/EHUPlaza de Europa1Donostia-San Sebastian 20018Spain

Diamond like carbon(DLC)coatings typically present good self-lubricating tribological properties that could be of interest in sliding dielectric contacts in multiple electrical *** this work electro-tribological studies have been performed on several DLC coatings against aluminum in different humidity conditions,in which the coefficients of friction(CoFs)and electrical contact resistance(ECR)were continuously *** show that CoF and ECR data can be linked to the properties of the coatings(thickness,finishing,microstructure,residual stresses,and wettability)and the degradation modes of their tribological and electrical ***,electro-tribological data can provide valuable information about the performance of dielectric coatings,the reasons behind it,and assist in the development of the *** also shows potential for on-line monitoring of coated parts in operation.

关键词： DLC electro-tribology ECR-electrical contact resistance coefficient of friction

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Sustainable career development for R&D professionals:Applying a career development system in Basque country

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International Journal of Innovation Studies 2020年第2期4卷 40-50页

作者： Edurne Loyarte-López Igor García-Olaizola Jorge Posada Iñaki Azúa Julián Flórez Vicomtech Mikeletegi Pasealekua 57Donostia-San SebastianES-20001Spain University of Deusto Unibertsitate Etorbidea24BilbaoES-48007Spain

The goal of this study is to measure the effectiveness of a career development system implemented at a research and technology organization at satisfying the context requirements of a decree issued by the Basque Country *** in-depth surveying of 80 R&D professionals over the five years,the authors aimed to determine whether a career development system,when it is linked to context requirements and researchers’contributions,could offer researchers feedback about their career aims and increase their job *** the five years of the study,the researchers’capacity to meet career requirements improved by 20%,and job satisfaction,although it declined at first,increased substantially in the last two years,reaching a historic high for the employee satisfaction survey.

关键词： Career development R&D personnel Research and technology organization Knowledge-intensive firms Employee job satisfaction

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Acute kidney injury in severely injured patients admitted to the Intensive Care Unit

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Military Medical Research 2021年第2期8卷 141-147页

作者： Alberto F.García Ramiro Manzano-Nunez Juan G.Bayona Maria P.Naranjo Dary Neicce Villa Manuel Moreno sebastian Ossa Juan M.Martinez Nathalia Martinez Juan C.Puyana Division of Trauma and Acute Care Surgery Department of SurgeryFundación Valle del LiliCaliColombia Clinical Research Center Fundación Valle del LiliCaliColombia Escuela de Medicina Ciencias de la SaludUniversidad del RosarioCarrera 98#18-49760001BogotaColombia Méderi Hospital Universitario Mayor Colombia School of Medicine Universidad ICESI(ICESI University)CaliColombia Department of Surgery University of PittsburghPittsburghPAUSA

Background:Our objective was to identify possible associations between clinical and laboratory variables and the risk of developing acute kidney injury(aki)in severely injured patients admitted to the Intensive Care Unit(ICU)for whom creatine kinase(CK)levels were ***:For this retrospective observational study,we analyzed adult trauma patients admitted to the ICU from 2011 to 2015 at Fundación Valle del Lili(FVL)University *** primary outcome was the incidence of *** regression analysis was used to assess risk factors for this ***:A total of 315 patients were *** trauma mechanisms were blunt(n=130),penetrating(n=66)and blast(n=44)*** median[interquartile range,(IQR)of injury severity score(ISS)was 21(16–29).aki developed in 75 patients(23.8%).Multivariate regression analysis revealed that the thoracic abbreviated injury scale(AIS)value(median(IQR)in the aki group:3(0–4)],Acute Physiology and Chronic Health Evaluation(APACHE Ⅱ)score[median(IQR)in the aki group:18(10–27)],CK greater than 5000 U/L,lactic acid concentration at admission,and dobutamine administration were independently associated with ***:We found that age,APACHE Ⅱ score,thoracic trauma,lactic acidosis,and dobutamine administration were independently associated with *** surgeons need to be aware of the increased odds of aki if one of these factors is identified during the evaluation and treatment of injured patients.

关键词： Rhabdomyolysis Wounds and injuries Acute kidney injury Critical care Trauma

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